Telkom billing system sucks,I app**** for R199 data they debited R495 then R404

My name is Ma****lela Maako, app**** to R199 telkom data 80 GiG Night ,80 gig day,In December I paid R495 ,I thought it was including Prorata as we agreed,My greatest shock came when in now in January I was debited R404 l. Why I am I paying what I didn't sign for . I app**** for R199, I paid R495 in December Today You debited R404 ,you billing system is worse I can tell you now ,I won't pay it. I better cancel this arrangement or I will reverse and later cancel 😞 😤 this contract Ur billing system sucks